A Cardiologist's Perspective on the Noom App

Updated July 2026

Noom greets you with a big promise: "life-changing results." It's become one of the most recognized names in digital weight loss, with tens of millions of users. And unlike a traditional diet, Noom bills itself as a psychology-based approach, focused not just on what you eat but on why you eat it, building awareness, accountability, and better habits. That framing genuinely appeals to me. So why do I recommend it only with reservations?

What is Noom, and how does it work?

It's a virtual coaching app built around behavior change. Founded by two engineers in 2008, Noom asks you a series of questions about your weight and health goals, then uses an algorithm to generate a "personalized" plan, a daily calorie budget, a coach, and a support group. You log everything, meals, weight, activity, and the app nudges you with lessons and messages to keep you on track. Its psychology angle is the real differentiator: it prompts you to examine why you're reaching for the chips (boredom? stress?) and to build healthier patterns in their place. As a concept, helping people develop a healthier relationship with food is exactly right.

What's the problem with Noom's food system?

Its "secret" isn't much of a secret: it's calorie reduction, dressed up in a traffic-light system. Foods get sorted by calorie density into green (water-rich fruits and vegetables), yellow (things like salmon, beans, and avocados), and red (calorie-dense foods, which lumps red meat and desserts together with nuts, seeds, and dried fruit). The app pushes you toward green and yellow and away from red. To its credit, Noom explains that "red" foods aren't necessarily bad, but the framework is still overly simplistic, because it ranks food almost entirely on calorie density while ignoring nutrient density. Those are not the same thing. Just like the Weight Watchers points system can steer you wrong, a system fixated on calories alone can push you away from some of the most nutritious foods on the planet.

Has Noom changed?

Yes, significantly, and it's worth knowing before you sign up. When I first reviewed Noom, it was purely an app. Since then it has moved aggressively into weight-loss medication, offering GLP-1 drugs like semaglutide and tirzepatide through its "Noom Med" telehealth arm, alongside the original behavior-change app (now called Noom Weight). GLP-1s are genuinely powerful tools, and I've written about them at length, but layering a prescription-drug business on top of a coaching app raises the stakes: these are real medications with real costs and real side effects, not an app subscription. If you go that route, it deserves the same scrutiny as any medical decision, ideally in conversation with your own physician, not just an online questionnaire.

Is Noom worth the money?

For the right person, the app can help, but go in clear-eyed. The classic Noom Weight app is relatively inexpensive now, around $17 a month on an annual plan, and its behavior-change focus can genuinely aid people who struggle with an unhealthy relationship with food. But it doesn't include meals, exercise classes, or in-person support, and if you want information beyond calorie density – like sodium content, for instance, which matters a great deal if you have high blood pressure - you'll have to find it yourself. Plenty of free trackers cover the basic logging. And be aware that subscriptions of this kind can be much easier to start than to cancel, so read the fine print before you enter a card number.

Where does Step One fit in?

Here's the telling part: under Noom's algorithm, Step One Foods land in the "red" category, because of their nuts, seeds, and dried fruit. This despite being made exclusively from ingredients shown to support cardiovascular health, and proven in a clinical trial to lower cholesterol in most people. That contradiction is the whole point: a system that flags nutrient-dense, heart-protective food as something to limit is measuring the wrong thing.

If you're using Noom but want to keep using Step One, don't worry about it, two servings come in at around 300 calories a day on average and are meant to replace part of what you're already eating, not add to it. Real, nutrient-dense food is always a "healthier choice" that almost always produces "positive health outcomes." No app required.

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